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. 1994 Jul;55(1):74–80.

Bloom Syndrome and Maternal Uniparental Disomy for Chromosome 15

Trevor Woodage, Madhuri Prasad, Joanne W Dixon, Roslyn E Selby, Dennis R Romain, Letizia M Columbano-Green, David Graham, Peter K Rogan, James R Seip, Arabella Smith, Ronald J Trent
PMCID: PMC1918231  PMID: 7912890

Abstract

Bloom syndrome (BS) is an autosomal recessive disorder characterized by increases in the frequency of sister-chromatid exchange and in the incidence of malignancy. Chromosome-transfer studies have shown the BS locus to map to chromosome 15q. This report describes a subject with features of both BS and Prader-Willi syndrome (PWS). Molecular analysis showed maternal uniparental disomy for chromosome 15. Meiotic recombination between the two disomic chromosomes 15 has resulted in heterodisomy for proximal 15q and isodisomy for distal 15q. In this individual BS is probably due to homozygosity for a gene that is telomeric to D15S95 (15q25), rather than to genetic imprinting, the mechanism responsible for the development of PWS. This report represents the first application of disomy analysis to the regional localization of a disease gene. This strategy promises to be useful in the genetic mapping of other uncommon autosomal recessive conditions.

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Selected References

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